Caching fallback if there is no exact hit

[dbartholomae]

Hi there,

at the moment, caching only hits if the exact same lockfile exists, but most of the time, even it the lockfile slightly changes, it is still beneficial to restore cache instead of downloading everything from scratch (most likely only ~1 dependency changed).
I would propose that, by default, cache falls back to node-cache-${platform}-${packageManager} instead of only checking node-cache-${platform}-${packageManager}-${fileHash}.
If this is of interest, I'm happy to provide a PR. It seems to only need a test and a one line change in https://github.com/actions/setup-node/blob/main/src/cache-restore.ts#L44

See also #304 (comment)

[oxc]

There seem to be implementations for this in #323 and thrivehealth@bd6483a

[belgattitude]

Just for sharing some workarounds with @action/cache

• With Pnpm 7+: https://gist.github.com/belgattitude/838b2eba30c324f1f0033a797bab2e31
• With Yarn 3+: https://gist.github.com/belgattitude/042f9caf10d029badbde6cf9d43e400a

[voxpelli]

New PR to fix this: #702